The Dragon 32 and Dragon 64 computers, along with the CoCo 1 & 2 computers as based on the reference design provided in the Motorola MC6883 Synchronous Address Multiplexer (SAM). The design uses a 6809E CPU, 6847 VDG and 32 or 64K dynamic RAM.
The SAM creates the required clocks for the CPU, and interfaces both the VDG and CPU to the dynamic RAM.
This project aims to be largely compatible with the Dragon 32 (and maybe the Dragon 64) but will use SRAM instead of DRAM. This may actually make the circuit more complex since the SAM is designed for DRAM.